The BGS Lexicon of Named Rock Units — Result Details

Dufftown Limestone Member

Computer Code: DUFF Preferred Map Code: SYMB
Status Code: Full
Age range: Neoproterozoic Era (AZ) — Neoproterozoic Era (AZ)
Lithological Description: Mid to dark grey, fine- to coarse-grained limestone with some dolostone; pelitic in places, but generally pure.
Definition of Lower Boundary: At the top of the underlying calcareous phyllites and semipelites, with thin limestone laminae of the Pitlurg Formation, where they give way to uniform limestone.
Definition of Upper Boundary: At the top of the limestone where it gives way to pelites and semipelites of the Mortlach Graphitic Schist.
Thickness: Very variable; laterally impersistent. Thickened by folding in part. In Glenrinnes c. 150m thick.
Geographical Limits: Banffshire coast at Sandend southwest along strike of Dalradian Supergroup outcrop to Cairngorms.
Parent Unit: Mortlach Graphitic Schist Formation (MOGS)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Parkmore Quarry, Parkmore, Dufftown; quarry face. 
Type Section  Stream section, Corriehabbie Burn, Folds of Corriehabbie, Glen Rinnes. 
Reference(s):
Memoir of the British Geological Survey, Sheet 75, in preparation. 
Thomas, C W, 1989. Application of geochemistry to the stratigraphic correlation of Appin and Argyll Group carbonate rocks from the Dalradian of northeast Scotland. Journal of the Geological Society, London, Vol.146, 631-647. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S086 S096